God of war 2 help and chat

[hamas123]

Hi, i have God of war 2 and i am stuck on one part. I flew pegasus and then pegasus got trapped in this place where this big statue man blows at you. I rescued pegasus and i kiled all the birds and then after you killed the last bird you be falling down and you have to press the button that comes on the screen to hang onto the cliff. I climbed the cliff, went to the building, killed the poeple and climbed the ladders but there is this part where you stand on a button and the gate opens and when you go towards the gate it closes. How do i go through the gate?